We see with Lapis, that we can get a gem back by taking its gem out, like what Steven did with the mirror. We also now know that the mirror would break.
So in conclusion, the gems are able to bring Rose Quartz back any time, but the host of the gem would shatter. Steven would die but Rose would be back.
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Steven Universe Oneshots
FanficHello and welcome to a book consisting of Steven Universe! The chapters range from headcanons, to short stories, and mostly angst. And ships. Have fun reading! (half of this is angst i lied, lapis is my son, garnet should be ruby x sapphire's ship...